/Engine/Source/Runtime/Engine/Classes/Components/InputComponent.h
Indicates that the InputComponent is interested in knowing/consuming a vector axis key's value (via GetVectorAxisKeyValue) but does not want a delegate function called each frame. Returned reference is only guaranteed to be valid until another vector axis key is bound.
[FInputVectorAxisBinding](API\Runtime\Engine\Components\FInputVectorAxisBinding) & BindVectorAxis ( const [FKey](API\Runtime\InputCore\FKey) AxisKey )